Development Length Calculator

Formula

The formula to calculate the Development Length (DL) is:

\[ DL = \frac{D \times S}{4 \times BS} \]

Where:

\( DL \) is the Development Length.
\( D \) is the nominal diameter of the rebar.
\( S \) is the stress in bar at design load.
\( BS \) is the design bond stress.

Definitions

Development Length (DL): The length of rebar required to be embedded or anchored in concrete to achieve its full strength.
Nominal Diameter of Rebar (D): The diameter of the reinforcing bar.
Stress in Bar at Design Load (S): The stress experienced by the rebar at the design load.
Design Bond Stress (BS): The stress between the rebar and the concrete that ensures the rebar is properly anchored.

Example

Let's say the nominal diameter of the rebar is 20 units, the stress in the bar at design load is 400 units, and the design bond stress is 100 units. Using the formula:

\[ DL = \frac{20 \times 400}{4 \times 100} \]

We get:

\[ DL = 20 \]

So, the Development Length (\( DL \)) is 20 units.